INSTALLATION, OPERATIONS AND MAINTENANCE MANUAL 37
Heaters for ther-mag circuit breaker controllers
For continuous-rated motors with a service factor
of 1.15 to 1.25, select the appropriate heaters for
the motor full-load current. For continuous-rated
motors with a service factor of 1.0, multiply the
motor full-load current by 0.9 and use this value
to select heaters.
is the minimum value of full-load current multiplied
by 1.25.
Provide short-circuit protection in accordance with
the National Electrical Code.
Size 0 and 1 (Standard and Ambient Comp.)
Size 2 (Standard and Ambient Comp.)
Overload heaters
Overload relays with automatic reset may
automatically start a motor connected to a two-
wire control circuit. When automatic restarting
is not desired, use a three-wire control circuit.
Circuit breaker tripping may be an indication that
a fault current has been interrupted. To provide
continued protection against fire or shock hazard,
examine all current-carrying parts and other
components of the motor controller and replace
any damaged components. If heater burnout
occurs, the complete overload relay must
be replaced.
Motor Full-
Load Amps
Heater
Number
Motor Full-
Load Amps
Heater
Heater
Number
Motor Full-
Load Amps
Heater
Number
Motor Full-
Load Amps
Heater
Number
To Next Page
Loading...
